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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5564 | serge | 1 | /* |
| 2 | * Copyright © 2014 Intel Corporation |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice (including the next |
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| 12 | * paragraph) shall be included in all copies or substantial portions of the |
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| 13 | * Software. |
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| 14 | * |
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 21 | * DEALINGS IN THE SOFTWARE. |
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| 22 | */ |
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| 23 | |||
| 24 | /** |
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| 25 | * \file opt_conditional_discard.cpp |
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| 26 | * |
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| 27 | * Replace |
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| 28 | * |
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| 29 | * if (cond) discard; |
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| 30 | * |
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| 31 | * with |
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| 32 | * |
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| 33 | * (discard |
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| 34 | */ |
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| 35 | |||
| 36 | #include "glsl_types.h" |
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| 37 | #include "ir.h" |
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| 38 | |||
| 39 | namespace { |
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| 40 | |||
| 41 | class opt_conditional_discard_visitor : public ir_hierarchical_visitor { |
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| 42 | public: |
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| 43 | opt_conditional_discard_visitor() |
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| 44 | { |
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| 45 | progress = false; |
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| 46 | } |
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| 47 | |||
| 48 | ir_visitor_status visit_leave(ir_if *); |
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| 49 | |||
| 50 | bool progress; |
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| 51 | }; |
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| 52 | |||
| 53 | } /* anonymous namespace */ |
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| 54 | |||
| 55 | bool |
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| 56 | opt_conditional_discard(exec_list *instructions) |
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| 57 | { |
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| 58 | opt_conditional_discard_visitor v; |
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| 59 | v.run(instructions); |
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| 60 | return v.progress; |
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| 61 | } |
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| 62 | |||
| 63 | ir_visitor_status |
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| 64 | opt_conditional_discard_visitor::visit_leave(ir_if *ir) |
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| 65 | { |
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| 66 | /* Look for "if (...) discard" with no else clause or extra statements. */ |
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| 67 | if (ir->then_instructions.is_empty() || |
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| 68 | !ir->then_instructions.head->next->is_tail_sentinel() || |
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| 69 | !((ir_instruction *) ir->then_instructions.head)->as_discard() || |
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| 70 | !ir->else_instructions.is_empty()) |
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| 71 | return visit_continue; |
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| 72 | |||
| 73 | /* Move the condition and replace the ir_if with the ir_discard. */ |
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| 74 | ir_discard *discard = (ir_discard *) ir->then_instructions.head; |
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| 75 | discard->condition = ir->condition; |
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| 76 | ir->replace_with(discard); |
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| 77 | |||
| 78 | progress = true; |
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| 79 | |||
| 80 | return visit_continue; |
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| 81 | } |